There is this girl in office, who keep glancing at me. pls read details?

I'm the only person who she doesn't know personally in her friend list. Do you think I should approach her?I once texted her. Everything went good for a day and then she stopped texting.Still she do glance me in office whenever she knows I'm passing by.Is it okay if text her again?Or is it the worse idea?I know it's better to talk in person. But not in a situation to do that.Is there any other way to approach her?Can anyone help me?